Bit error rate performance of a generalized diversity selection combining scheme in Nakagami fading channels

Sulyman, Ahmed Iyanda; Kousa, Maan A.

doi:10.1109/wcnc.2000.904778

Cited by 47 publications

(17 citation statements)

References 4 publications

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“…In Table 3, we tabulate the effects of user mobility on the behavior of the threshold-based scheduler, after simulating several results similar to Figures 4,5,6,7,but for different values of the threshold. It can be observed from this table that when the scheduler operates with large threshold, such as μ> 0.5, the algorithm will seek high capacity enhancement (or less user fairness), and thus users with high mobility tend to be given fewer number of PRB's.…”

Section: User Mobility Issuesmentioning

confidence: 99%

“…Threshold-based selection method was first proposed by Sulyman and Kousa in [5] for the diversity combining problem in a single-user transmission system, and has been widely studied in the literature [6][7][8][9][10][11][12][13]. In the context of multiuser scheduling in WiMAX OFDMA network, the author in [1] recently examines the use of a threshold-based multiuser scheduling, where a BS scheduler uses the energy threshold criterion [5][6][7][8][9][10][11][12][13], to select the users to be scheduled for downlink transmission in WiMAX network at any time instant.…”

Section: Introductionmentioning

confidence: 99%

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Capacity analysis of threshold-based SNR scheduler in LTE systems

Sulyman

Ahmad

Hassanein

et al. 2013

EURASIP J. Adv. Signal Process.

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This paper presents the capacity analysis of a threshold-based SNR scheduler in the long-term evolution (LTE) cellular systems. LTE standard has adopted multiuser OFDMA, and stipulates adjacent subcarrier groupings for mapping the physical OFDM subcarriers into resource blocks that form the basic unit of radio resource management (RRM) in LTE network. The standard however did not specify the details of the RRM algorithm to be employed, leaving this aspect for vendors to differentiate their products. Popular RRM algorithms such as roundrobin (RR), proportional fairness (PF), and maximum SNR (MaxSNR), have been implemented recently as operatorselectable options on LTE base station (BS). In this paper, we present a threshold-based SNR scheduler that has the capability of modeling all of the above-mentioned algorithms and thus allows vendors to combine the separate implementations of these algorithms into one generalized scheduling algorithm, where the threshold level used at any time instant defines the scheduling discipline to be realized. We derive the capacity enhancement achievable using the proposed scheduling scheme, and also present system-level simulations to corroborate the analysis. Our analytical and simulation results indicate that the proposed algorithm models the existing ones closely at different values of the threshold. The results also demonstrate the data rate enhancements, and the level of user fairness, achievable in the network for various levels of the threshold.

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Section: User Mobility Issuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacity analysis of threshold-based SNR scheduler in LTE systems

Sulyman

Ahmad

Hassanein

et al. 2013

EURASIP J. Adv. Signal Process.

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“…The number of selected fingers m is decided a priori in [1]- [4], while it varies dynamically in [5]- [7]. Note that the MRC is a special case of a GSC, where the number of selected fingers m is fixed to L. For the latter approach in which m varies dynamically, an absolute threshold GSC (AT-GSC) selects fingers whose SNRs are greater than a given threshold [5], [6]. Alternatively, a normalized threshold GSC (NT-GSC) selects fingers whose relative SNRs to the maximum SNR among all fingers are greater than a given threshold [5], [7].…”

Section: Introductionmentioning

confidence: 99%

Minimum selection GSC and adaptive low-power rake combining scheme

Kim

Reed

Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03.

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In this paper, we investigate a new generalized selection combining (GSC) technique and an adaptive rake combining scheme to save the power consumption of mobile rake receivers for wideband CDMA systems. The new GSC technique called minimum selection GSC (MS-GSC) selects a minimum number of rake fingers, while maintaining the combined SNR larger than a given threshold. The proposed adaptive rake combining scheme dynamically adjusts the threshold value to maintain the desired BER. Therefore, our rake combining scheme can be integrated into any GSC, which select fingers based on a given threshold value. The proposed MS-GSC shows a low standard deviation in bit error statistics and is advantageous in practical implementation. Our experiments indicate that the proposed adaptive combining scheme reduces the power consumption of a mobile rake receiver up to 67.8 % by turning off unselected rake fingers.

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“…Two further developments in GSC have been proposed and analyzed [2], [6], [7]. The key idea is to allow M vary by discarding highly faded branch signals dynamically depending on the received branch signal strength profile.…”

Section: Introductionmentioning

confidence: 99%

“…The key idea is to allow M vary by discarding highly faded branch signals dynamically depending on the received branch signal strength profile. Sulyman and Kousa [6] and Yue [2] present a normalized threshold GSC (NT-GSC) scheme, which combines the branches whose relative branch strength (the ratio of the SNR of each branch to the maximum SNR) exceeds a fixed normalized threshold T (0 < T ≤ 1). Yue [2] presents AT-GSC, which combines all the branches with SNR's above a fixed threshold (say, γ th ).…”

Section: Introductionmentioning

confidence: 99%

A new hybrid generalized selection combining scheme and its performance over fading channels

Chen

Tellambura

2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733)

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Abstract-Emerging very high-data-rate wireless communications requires that traditional diversity systems be adapted so that some performance is sacrificed for complexity reduction. With this goal in mind, we investigate the recently-developed absolute threshold generalized selection combining (AT-GSC). We show that AT-GSC has poor bit-error rate (BER) performance when the average branch signal-to-noise ratio (SNR) is comparably lower than the preset threshold. This paper therefore develops a new diversity combining scheme, referred to as switching GSC (S-GSC). This scheme combines all branches whose SNR's exceed a preset threshold and if all the branches drop below the threshold, the output is the single branch with the maximum SNR. We prove that for any two-dimensional amplitude/phase linear modulation schemes, the symbol error rate (SER) of S-GSC lies between those of maximal ratio combining (MRC) and selection combing (SC). Importantly, the complexity of S-GSC is only slightly above that of AT-GSC. We derive the moment generating function (mgf) of the S-GSC output SNR over independent fading channels. For identically and independently distributed (i.i.d.) Rayleigh fading channels, we also derive the output probability density function (pdf) and cumulative distribution function (cdf) and analyze the error rate and the outage probability performance of S-GSC. Higher order moments of the S-GSC output SNR are also derived. These theoretical results are sufficient to completely characterize the performance of S-GSC and enable one to compare S-GSC with conventional diversity schemes.

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Bit error rate performance of a generalized diversity selection combining scheme in Nakagami fading channels

Cited by 47 publications

References 4 publications

Capacity analysis of threshold-based SNR scheduler in LTE systems

Capacity analysis of threshold-based SNR scheduler in LTE systems

Minimum selection GSC and adaptive low-power rake combining scheme

A new hybrid generalized selection combining scheme and its performance over fading channels

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